<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
        <!--下面两个节点用于兄弟节点定位-->
    <div>brother 1</div>
    <div id="D"></div>
    <div>brother 2</div>
</body>
</html>